What is it? Kaivo by Madrona Labs is a VST synthesizer. But not just a regular VST synth, this one is a combo synth with physical modelling and granular synthesis. A very original combo, but let's see how it all works out in practice..
GUI: The GUI, as in Aalto, is very minimalistic and straight-forward. No fake wood here, this one follows the same philosophy as ValhallaRoom (among others) to deliver a simple and very usable GUI. It's routable, which can be done in a "patch-bay" (what I like to call it) in the middle of the synth. This approach makes sure it all stays as uncluttered as possible. Also worth noting the visual feedbeck provided in most sections of the synth, which is a very helpful extra. And finally, it's resizable.
Features & sound: Next to the "Key controls" (glide, voices, and so on), we find the sequencer. It's a standard 16-step sequencer at first sight, but has some interesting functions up its sleeve. For example, the scalable controls for rate, offset and number of steps make it easy to make complex patterns. You can also run multiple to control different voices, and also make them run out of sync. Needless to say, this can provide some very interesting results.
Next we have the "2D LFO". This is not a normal LFO, but rather two LFOs 90 degrees out of phase with each other. You have standard LFO shapes, like circle, but also some entirily new ones such as gaussian and knight. Just turning this one and messing around with it for a few seconds can be quite beneficial. Right next to it is the noise oscillators, which also works great. Nothing way out of the ordinary, but definetely useful.
Then we have the envelopes. Nothing that's very special about them, but they do everything you would want some envelopes to do. And the patching makes it easy to map both of them to pretty much anything.
On to the granulator. It supports sample import, so you can import anything in wav format (haven't tested it with files in other formats). You can change the "position" both heightwise and lengthwise. It's not overflowing with controls, but by just messing around with those provided you can get some very unusual sounds quickly.
Right next to it we have the gate, which does pretty much what gates usually do. But the "leak control", which looks like it was added after release, has a high pass-like effect. Worth trying out. Next to the gate we resonator and the body (both resonators). The first resonator is polyphonic and has a choice of seven different models (different strings, chimes and springs). Determines the object being plucked or strung. A dry/wet knob is present to balance it all, so is are brightness and sustain controls, as well as cutoff, nonlinearity and pitch. The second resonator is the "body" one. This one is monophonic, and you have four selections of different "surfaces". They are 2D, so both X and Y can be modulated. So can the rest of the controls, which are very similar to the ones found on the resonator.
When it comes to the sound, I don't believe that this has some ultra special sound engine inside that makes everything sound good. It's all the weird features and combinations of these that do it. I could create some truly excellent patches with this, both super-realistical type sounds (do yourself a favor and check out the koto patch) and very strange ones. It definetely brings something new to the table, and would recommend it to anyone looking for some new sonic territory to explore.
Performance: It's quite CPU-hungry, but that's the only complaint I have. I can even forgive it considering its impressive feature set. Would rather bounce down a track or two than not being able to use this. Still, if possible, a reduction of CPU usage would be very welcome.
Conclusion: Wonderful synth offering something truly different. Operation is easy too, boasting a great GUI. Giving it the perfect score in spite of the high CPU usage (climbed into my top 3 favorite synths). It's that good.